# ITC-106 not tunable at all **URL:** \ **Category:** Questions & Answers\ **Tags:** smart-controller\ **Created:** [October 11, 2022, 4:52am UTC](https://community.inkbird.com/t/itc-106-not-tunable-at-all/907 "2022-10-11T04:52:24Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![etchorner](https://avatars.discourse-cdn.com/v4/letter/e/838e76/32.png) [@etchorner](https://community.inkbird.com/u/etchorner)\ **Post date:** [October 11, 2022, 4:52am UTC](https://community.inkbird.com/t/itc-106-not-tunable-at-all/907/1 "2022-10-11T04:52:24Z")
I have wired up an ITC-106VH using a K-type thermocouple and an SSR to control the temperature of a toaster oven, with the goal of maintaining Sv=400F at +/-3F. With the factory default settings for the P=50, I=30, and D=8 values, I see overshoots of Sv by +60F initially, and then settles at a 5.2 minute oscillation period of -7F to +34F from Sv. Using the autotune methods yields nearly identical results. Failing to perform properly either in factory default mode or autotune mode, I attempted various empirical manual tuning methods which I observed to have no appreciable effect different from my first attempts: - Operate in P mode only, by setting I=9999 and D=0 and vary the P value looking for a stable Pv. When trying P between values of 1 and 5000, no significant changes in behavior were noted and the variance is similar to that of the factory default values: ![chart](https://canada1.discourse-cdn.com/flex031/uploads/inkbird1/original/1X/2759d30f0b560b8bd84ca3bdd184dc228d9b305b.png) - Operate PI mode, setting P=100 and changing I values. I tried many values if I between 375 with no difference. As a brand new user, I can only attach one media object, but the absence of any effect on the I value and the similarity of the Pv curves is unchanged from the P-only attempt at tuning. One other thing of note: regardless of PID values, in every situation described above, the ITC-106 turns off the output exactly when the temperature rises through Pv=Sv, and turns the output back on exactly when falling through Pv=Sv… **as if none of the proportional, integral, or derivative terms are having any impact at all on the system.** Do I have a defective ITC-106 or am I doing something wrong, because I’ve been testing this thing for three straight days and am getting close to getting rid of this PID controller. ---
**Author:** ![Tania](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/tania/32/88_2.png) [@Tania](https://community.inkbird.com/u/Tania)\ **Post date:** [October 11, 2022, 9:41am UTC](https://community.inkbird.com/t/itc-106-not-tunable-at-all/907/2 "2022-10-11T09:41:15Z")
Hello, If you have high requirements for temperature accuracy, maybe the ITC-100VH will be more suitable. The ITC-100 series is an industrial thermostat with a wide temperature range, suitable for a variety of heating systems. The ITC-106 series is a household controller, suitable for slow cooking, wine making, etc. If professional control is required, it is recommended to purchase the ITC-100 series. ---
**Author:** ![choucsou](https://avatars.discourse-cdn.com/v4/letter/c/77aa72/32.png) [@choucsou](https://community.inkbird.com/u/choucsou)\ **Post date:** [October 14, 2022, 10:18am UTC](https://community.inkbird.com/t/itc-106-not-tunable-at-all/907/3 "2022-10-14T10:18:23Z")
Hello, The curves should flatten (sadly sometimes after a long time) around Sv even with an “household” controller such as the ITC-106 (if it works according to its specifications). As etchorner said, **if none of the proportional, integral, or derivative terms are having any impact at all on the system** , there shoud be a problem with the PID (either configuration (is there a PID mode vs a direct mode ?) or the PID device (defective)). Regards ---
**Author:** ![etchorner](https://avatars.discourse-cdn.com/v4/letter/e/838e76/32.png) [@etchorner](https://community.inkbird.com/u/etchorner)\ **Post date:** [October 29, 2022, 2:25am UTC](https://community.inkbird.com/t/itc-106-not-tunable-at-all/907/4 "2022-10-29T02:25:40Z")
Not particularly a requirement for precision, but the ITC-106 was only giving me control over a 50°C range (+40°/-10°) and was not responding to any useful degree to any manual or automatic tuning attempts. Presuming on solid facts that the ITC-106 unit was defective, I’ve replaced it with an ITC-100VH. With only a few manual tuning runs, it now controls my tempering oven to ±0.1ºC. Much better, although the tuning parameters are not strictly PID…but it works. I retired the bad ITC-106 to use as a temperature readout on my gas forge…it works fine in a non-controlled environment. ---
**Author:** ![choucsou](https://avatars.discourse-cdn.com/v4/letter/c/77aa72/32.png) [@choucsou](https://community.inkbird.com/u/choucsou)\ **Post date:** [October 30, 2022, 8:13am UTC](https://community.inkbird.com/t/itc-106-not-tunable-at-all/907/5 "2022-10-30T08:13:15Z")
@etchorner What do you mean by : the tuning parameters are not strictly PID ? ---
**Author:** ![frans](https://avatars.discourse-cdn.com/v4/letter/f/71e660/32.png) [@frans](https://community.inkbird.com/u/frans)\ **Post date:** [April 17, 2023, 8:29am UTC](https://community.inkbird.com/t/itc-106-not-tunable-at-all/907/6 "2023-04-17T08:29:10Z")
Did you need to recalibrate the probe after changing to the 100VH?